Inner display
951 × 669Enter a website address above to load it here.
Free tool by Pinnacli
iPhone Duo simulator for websites
Test your website online on both iPhone Duo displays. This free iPhone Duo web simulator opens your site in a real remote browser, so you can click, scroll, rotate and compare responsive designs.
Public websites only. No account needed.
Outer display
466 × 678Waiting for the second tab…
Open display. Click and scroll inside the preview.
How accurate is the preview?
Independent tool by Pinnacli. Not affiliated with or endorsed by Apple.
Interactive, not an embedded website. A temporary remote Chromium browser opens the page. Click links, scroll, and enter text. Some sites may still require CAPTCHA or block automated browsers.
Duo dimensions. Outer: 466 × 678. Inner: 669 × 951, or 951 × 669 in landscape. These point sizes come from the Xcode 27.1 simulator device profile: the outer panel renders at 3×, and the inner display draws into a 2007 × 2853 logical raster at 3× that the 1878 × 2670 physical panel downsamples. Dividing the physical panel by three (890 × 626) understates the inner display by 61 points. Safari's actual viewport, toolbars, safe areas, fonts, and fold behavior are not reproduced. Display Zoom and browser zoom can change the result.
Side controls are not shown. Apple's design guidelines say iPhone Duo moves toolbars and tab bars to the side edge on the outer display and on the inner display in landscape; the inner display in portrait keeps standard horizontal bars. Simulator measurements put the side column at 84 points on the trailing edge, so app content measures about 382 points wide on the outer display and 867 on the inner in landscape. Safari may differ, so treat these presets as the full display size, not the web viewport.
The fold only matters when the phone is partly open. Apple treats the center of the inner display as a reserved region only while the device is partially folded. The Book and Laptop poses show this area as a visual guide.
Short, private sessions. Browsing state is removed when the browser session closes. Sessions last up to 5 minutes and close after 90 seconds without input. Avoid passwords, payments, and sensitive information. Audio, downloads, new tabs, and native device features are not supported.
Check your website across two display layouts
Duo Preview is an iPhone Duo website preview and online mobile website tester for designers, developers and site owners. Explore whether your navigation, content and forms adapt when the available screen space changes.
- Open a public URL. Your temporary browser loads the website and lets you interact with it.
- Compare inner and outer displays. Rotate each layout and try a narrower window to uncover overflow and awkward breakpoints.
- Review the result. Click your menu, scroll long pages and test form fields. Save a view to share layout issues with your team.
iPhone Duo preview questions
How do I test a website in an iPhone Duo simulator online?
Enter a public website URL and select Open website. Choose the inner or outer display, rotate the preview, and enable Compare displays to inspect both layouts. You can click links, scroll, fill in non-sensitive test forms and save the current view.
Is this an iPhone Duo emulator or an iOS Simulator?
This is a website layout simulator powered by remote Chromium. It does not run iOS, Safari, native apps or an iPhone system image. For final platform testing, use Device Hub in Xcode, which Apple provides for previewing iPhone Duo poses, and a physical device. Duo Preview helps you explore responsive layouts before that testing.
Which iPhone Duo screen sizes can I test?
The outer display preset is 466 × 678 CSS pixels; the inner display is 669 × 951, or 951 × 669 in landscape. Rotating swaps width and height. These point sizes come from the Xcode 27.1 simulator device profile at 3×, not from dividing the physical panels; Safari viewport sizes are still not verified. Half-width mode approximates a narrower app window.
Does changing the fold angle change the website?
Book and Laptop poses add a visual fold guide. They do not send device-posture events or emulate a physical hinge. Rotation and half-width mode change the actual browser viewport, so a responsive website can adapt its layout.
Can I open a site that blocks iframe embedding?
The service opens the URL in a separate remote browser and streams the view, so iframe embedding restrictions do not apply. CAPTCHAs, bot protection, login requirements and site-specific restrictions can still prevent access.
Is the online preview free?
Yes. No account or installation is required. Each session lasts up to 5 minutes and closes after 90 seconds without input. The service has limited browser capacity; try again later if all sessions are busy.
What should I check in a responsive website preview?
Check horizontal overflow, navigation, readable text, image cropping, sticky elements and form controls. Compare the outer portrait display with the wider inner display, then rotate and test a half-width window. This visual check does not measure page speed or replace an accessibility audit.